The main water line enters a house on the first floor. The line has a gauge pressure of 1.70 105 Pa.
(a) A faucet on the second floor, 6.5 m above the first floor, is turned off. What is the gauge pressure at this faucet?
(b) How high could a faucet be before no water would flow from it, even if the faucet were open?

(b) The pressure at a height H above the first floor is
1.70*10^5 N/m^2 - (density)*g*H

Set (density)*g*H = 1.70*10^5 N/m^2
and solve for H

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